Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d478dd79cceed8d…

MALICIOUS

PDF

68.0 KB Created: 2021-09-25 06:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ff39aba49274ab6da9872336a62eecf4 SHA-1: b6a11dee3e1b4bc293bd2c696e224eda3613de84 SHA-256: 2d478dd79cceed8de625507ea94d0b3576c9eb6a5f1cbdaea1a9b61ee5800b19
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure with an image-only design and clickable action triggers. It contains numerous links to external PDF files hosted on various domains, suggesting a link farm intended to distribute malicious content or redirect users to phishing sites. No scripts were extracted, but the PDF structure and URL patterns are indicative of a common phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://glavis.biz/userfiles/file/55928355742.pdf In PDF document text
    • http://mathrainbow.com/userfiles/file/32556773867.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/50792476341.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/33380557125.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/19396004565.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/35024996469.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/5181879586.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/93611892367.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/limalipezadukodejeloxu.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/dozilugagetigoga.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/42163681415.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/vijasipaga.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/rogejozatiwanivim.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/ec7ee9b1ef2029486ec768dfaef1fe94/25269561761.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/34191143568.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/7bhkkd91ab7vc1k4o2a8q8ivt4/50558182601.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-15/20210915164501912785.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/gilije.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/24e6og8tjbfhdjbv1eihocetpl/80277660913.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/1131826263.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130b60735570---62530425940.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/6933300515.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/83971557200.pdfIn PDF document text
    • https://stauber.lt/images/files/vupekuji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=android+is+an+application+softwarePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF34 10680 bytes
SHA-256: b04392e2ec518dab8c73c5cf6b9da435a0b9c0e1c78158b992f3191e1bef64a9
font_01_sfnt_off0000c7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFD 13932 bytes
SHA-256: 20481bae834c48fb5ce2a29c36a4c72cbb625f5c5402703cbab0b35d7dfd0b3c